Gauging fixture



Dec. 1, 1959 E. J. SVENSON GAUGING FIXTURE Filed May 29, 19s:

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. fIhepresent invention relates to a novel gauging device for checking the relationship between surfaces of the work piece, "and moreparticularly to a novel device which to check internal surfaces of gear is especially adapted PU I PihQ V i f In general, gear pumpsusually include a pair of housing I members having mating faces with recesses formed in these faces for receiving thegears of the'pump. It is important that the bottom surfaces of these'r'ecesses be accurately located with respect to th'ejfaceof thehousing memberin order to preventeither binding of the pump gears or undue leakage of fluid past the gears. In the past, "devices for checking the bottom surfaces of the gear pum housing rejces's'es havehbeen 'unduly "complicatedfor have been such that thechecking operation has beenslow'and, thereforeexp'ensive. Iti's, therefore, an

Unied State Pa object "of the present invention to fprovide -a novel gauging device which is of simple construction ahdwhichhtay be used toprovide "arapid, yet aceur'ate,-check"of 'the internalsulrfaces of workpieces suchf'as gear housings.

A more s'pecificobject' .ofvthejpresent invention is to provide aiiovel gauging device of the above described type which may be used to indicate the relationship between the internal 'surfacefof a workpiece and agiven face thereof, and also to indicate any variations in the formation oflsaid internalsur fa ce'.- p p Another object ofthe present invention is 'to provide a novel gauging device of the' abovedescribed'type which I may be 'quickly and easily read the" operator, thereby facilitating the gauging operation.

Still another object ofthe present invention is to provide a novel gauging device of the'above described type v which may be quickly adapted for checking workpieces ofvari'ous sizes; I fl I t Otheri objects and advantages 6f,.lthe.present invention i a d w n s; w s

.willibe'come appare tfr om the followihgdescriptioni and Fig. 1 is a side ele tional view partiallybrokeniaway illustratingagaiigiiig device the principles of this inventien;

1g. 4 is i a plan, mew-1a as pim housingmember 2 ened by reinforcing webs 20 and 22. In order't o mount "ahindicator mechanism adjustably on thebase in the mariner described fully hereinbelow, a slide track 24 extends forwardly of the wall 16, and the wall is provided with an elongated vertically disposed slot 26 in alignment With the track 24. I l I An adapter plate 28 is detachably mounted on the head plate 18' of the base in order to accommodate a workpiece of a particular size. It will be obvious from the description hereinbelow that the gauging device 10 may be quickly and easily adapted for gauging worlc pieces such as gear pump housings of various sizes merely bysubstituting adapter plates 28. The adapter plate maybe conveniently and quickly secured to the head plate 18 by a plurality of screws 30; In order accurately to locate and securely retain the plate 28 in position, a pair of dowel pins 32 and 34 are inserted into aligned apertures in the plates 18 and 28. i

The novel gauging device of this invention is particularly adapted for checking agear pump housingmember 36 shown in Figs. 1 and 4. The housing member 36 isof the usual construction and includes a cavity 38 for receiving the pump gears and spaced apertures 40 and 42 for receiving shafts rotatably supporting the pump gears. It is, of course, understood that the illustrated housing member 36 is designed to be used with a second member, which member will be secured to the face 44 for closing the cavity 38. In order to assure proper operation of the pump gears, it is necessary that the bottom or inner surface 46 of the cavity 38 be accurately located and formed with respect to the face 44. In accordance (with the present invention, the inner surface 46 of the ho usingfrnember may be checked by placing the housing member'on the'adapter plate so that the face 44 rests on the top or locating surface 48 of the adapter plate. With the housing member thus definitely located, the surface 46 is'checked'by the indicator mechanism described below.

The indicator mechanism, which is generally designated by the nu eral 50, includes a feeler rod 52 extending upwardly through suitable apertures or openings in the head 18 and adapter plate 28 for engagement with the housing surface -46, as shown best in Fig. 1. The feeler rod 52 is connected at its] lower end to a suitable dial 54- which isv constructed in the usual manner so that upon reciprocation of the rod 52, a pointer 56 of the dial device is actuated. The dial device includes spring means Within the .case thereof for normaly biasing the rod 52 upwardly for yielding engagement with the pump housing. Thus,the feeler rod always contacts the surface '46 of the pump housing and actuates the dial pointer to indicate the relationship between the surface 46 and the face 44 of the pump housing.

In order to provide an initial. rough adjustment of the 'dialhiri'echanism, suitable means is provided for adjustably mounting the dial on the base 12. This means includes the above described track 24 which cooperates with 'a grooved slide block 58 secured to the back of the dial housing. A clamping screw 60 extends through the slot 6 .26 in the base 12 and is adapted to be threaded into a more .speciiicallyito the drawings, wheremember 12. The use member a s a ttpo 7 adapted to-rest on-any suitable support surface; .A' front wall 16 extends upwardly. from the foot portion, and merges with ahead plate 18.. The foot portion, front wall; and head plate are preferably formed' frontan .inte gral casting and, .if desired, thecasting may befstr'engthsuitable threaded aperture in the slide block 58, whereby upon tightening of the clamping screw the dial mechanism is securely held in place. Preferably, a knob 62 the surface 46 may be checked merely by sliding the housing member 36 over the locating surface 48 of the adapter plate. However, in checking gear pump housings, it is particularlydesirable to checkthe portions of-the surface 46 which are immediately adjacent to and concentric .with thepump shaft openings 40 and 42. Therefore, in accordance with the present invention, a locating pin is mounted on the adapted plate for entry into either the opening 40 or 42 in the pump housing member. This 10- eating, pin includes an enlarged portion 66 whichextends outwardlyfrom the adapter plate to enter the shaft openings in the pump housing. Preferably, the portion 66 has a diameter substantially equal to the diameter of the shaft intended to be inserted into the opening, whereby the pumphousing may be rotated so that the feeler rod 52 engages portions of the surface 46 concentric with the shaft opening. The locating pin also includes an inner portion 68 which is received in a suitable aperture in the adapter plate. Preferably, the adapter plate includes an enlarged centrally located boss 70, whereby the portion 68 of the locating pin may be extended to facilitate accuracy.

A brief description of the operation of the novel gauging device 10 is as follows. An adapter plate 28 and a locating pin 66 are assembled together and mounted on the base 12 in accordance with the particular size of the housing member to be checked. Preferably, a pump housing which is of standard and known dimensions is placed on the locating surface of the adapter plate in the manner shown in Fig. 1, and the indicator mechanism is then adjusted so that the feeler rod 52 engages the inner surface of the housing and the pointer 56 registers zero. The standard pump housing is then removed and replaced by a housing member to be checked. As set forth above, the feeler rod 52 is resiliently urged upwardly so that it is always in contact with the inner surface of the pump housing. With the housing in the position shown in Fig. 1, it may be rotated around the locating pin 66, whereupon any variations in the surface 46 with re- 'spect to the base 44 of the housing member will cause the feeler rod 52 to move up or down, thereby actuating the dial pointer 56. It is obvious that the rather large 'dial may be quickly and easily read by even an inexperienced operator. Furthermore, in order to facilitate readingof the dial, it should be noted that the wall 16 and the head plate 18 of the base 12 are inclined so as to present the dial at an angle for easier reading.

, From the above description, it is seen that the present invention has provided a novel and simple gauging device which maybe utilized to check quickly and easily internal surfaces of work pieces, such as gear pumphousings. In addition, it is seen that the novel device of this invention may be quickly adapted for checking gear pump housings in various sizes merely by substituting adapter plates 28 and/or locating pins 66. Furthermore, it is seen that the present invention has provided a device es-- pecially adapted for rapidly and easily checking portions of internal surfaces of gear pump housings concentric with a gear pump shaft.

While the preferred embodiment of the present inven tion has been illustrated and described herein, it is obvious that many changes may be made in structural details with- 'having a locating surface for engagement with portions of said face of the work piece, indicator means mounted in cooperative relationship with said first 'mentioned means and substantially below said locating surface, said indicator means including an element extending outwardly from said locating surface for engagement withthe recessed surface to be checked when said'face of the Work piece is in engagement with said locating surface, whereby said indicator means checks the relationship between said recessed surface and the eraser the 'work piece, and means associated with said locating surface for limiting movement of the work piece thereover such that the surfaces of the work piece other than the surface to be checked clear the indicator means.

2. A gauging device forchecking a surface of a recess in a face of a work piece, comprising means having a locating surface slidably engageable-with said face of the work piece, a gauge unit mounted in cooperative relationship with'saidfirst mentioned means, said gauge unit having body means disposed below said locating surface and a plunger carried by said body means and extending outwardly from saidlocatingsurface for engagement with the recessed surface to be checked and having means for resiliently biasing said plunger toward engagement with said recessed surface so that upon relative movement of the work piece with respect to said locating surface said indicator plunger engages and checks various portions of said recessed surface, and a bearing projection substantially parallel to said plunger for engaging a complementary bearing surface on the work piece to limit transverse movement of the outwardly extending surfaces of the work piece to substantially pivotal motion clearing locating surface for engaging said work piece in engagement with said locating surface and limiting movement of the work piece to rotation about said predetermined axis, and indicator means having an element laterally offset from said predetermined axis and resiliently biased for'yieldable engagement with the recesed surface to be checked so that upon relative movement of the work piece and said locating surface said indicator element engages and checksvarious'portions of said recesed surface.

4. A gauging device for checking the relationship between a face of a work piece and a surface of a recess in said face, comprising means having a locating surface 'slidably engageable with said face of the work piece, pin means extending substantially normally from said locating surface and insertable into an aperture in the work piece for engaging said work piece and limiting movement thereof to rotation about said pin means, and indicator means including an element laterally ofiset from said pin means and resiliently biased for yieldable engagement with the recessed surface to be checkedso that upon rotation of the work piece said indicator element engages and checks various portions of said recessed surface.

'5. 'A gauging device for checking a surface of a recess in a face of a work piece, comprising upstanding means having a locating surface for engagement with said face of the workpiece, an indicator unit mounted substantially below said locating surface, said indicator unit including a resiliently biased element extending upwardly from said locating surface for engaging therecessed surface to be checked when the face ofthe workpiece is in engagement with said locating'surface, said indicating means being disposed at an angle to the vertical to facilitate reading thereof, 'and a bearing projection substantially parallel to'the resiliently biased element of the indicator unit for engaging a complementary bearing surface on the work "piece to limit transverse motion of the outwardly extending surfaces of the-work piece to substantially pivotal 'motion clearing the said resiliently biased element.

g 6. A' gauging device for checking a surface of a recess in the face of a work piece, comprising means for locating the work piece and including a locating surface on which the face ofjthe'workpiece'is disposed and means engagabl with the work piece to limit transverse movement thereof over .the' said; .locatingi surface, gauge means projecting into therecess .of the located work piece for sliding engagement with the surface to be checked, said locating to be checked clearing said gauge means, and means mounting the locating means and gauge means for resilient movement relative to each other whereby any variations in the surface to be checked cause the locating means and gauge means to assume various positions relativeto each other and thereby indicate changes in the surface being checked relative to the face of the work piece.

UNITED STATES PATENTS Pointer 1 May 10, Picard Oct. 24, Aller Oct. 24, Leatherman Oct. 19; Dow July 8,

FOREIGN PATENTS Germany Feb. 18,

Great Britain Nov. 15, 

